seasonal tilt gain [RE-wrenches]

[Kurt Nelson]

Your free subscription is supported by today's sponsor:
-------------------------------------------------------------------
Show your pride with a free* USA T-shirt.  Click here to confirm 
your address.
http://click.topica.com/caac8udbz8Qcsbz9JC9a/PermissionData
-------------------------------------------------------------------

NREL's PVWatts (version one) also makes it easy to compare but I don't
think any of these programs factor in snow shading.  The steeper angle
of an array adjusted for winter angle of incidence also facilitates snow
shedding in snow country.

Kurt Nelson

-----Original Message-----
From: Doug Pratt [mailto:dmpratt at sbcglobal.net] 
Sent: Sunday, February 13, 2005 6:56 PM
To: RE-wrenches at topica.com
Subject: RE: seasonal tilt gain [RE-wrenches]

Your free subscription is supported by today's sponsor:
-------------------------------------------------------------------
Show your pride with a free* USA T-shirt.  Click here to confirm 
your address.
http://click.topica.com/caac8udbz8QcsbAsGU2a/PermissionData
-------------------------------------------------------------------

Crunch numbers? Hey, make it easy Conrad. The NREL Redbook gives you
average
kilowatt hours per month at latitude, latitude + 15 degrees, and
latitude -
15 degrees. (Plus at 0 and 90 degrees, and with single or dual axis
trackers
just in case you want ALL your options.) It covers hundreds of US sites
with
actual data collected 1960 thru 1990. It's all on pdfs, download the
whole
enchilada, or individual States here:
http://rredc.nrel.gov/solar/pubs/redbook/ 

And just in case you want the really easy answer, it's about 5% to 7%
gain
for most of the US if you adjust tilt twice a year.

Cheers,
Doug Pratt
DC Power Systems 

-----Original Message-----
From: Conrad Geyser [mailto:conradg at cape.com] 
Sent: Sunday, February 13, 2005 3:06 PM
To: RE-wrenches at topica.com
Subject: seasonal tilt gain [RE-wrenches]


Has anybody crunched the numbers on seasonal tilting of PV panels?  Like
what overall gain could one hope to get?
Conrad Geyser
Cotuit Solar

Your free subscription is supported by today's sponsor:
-------------------------------------------------------------------
Get a FREE* MP3 Player - yours to keep! Click Here Now!
http://click.topica.com/caac8uxbz8QcsbAsGU2f/MP3 Player Giveaway
-------------------------------------------------------------------

- - - -
To send a message: RE-wrenches at topica.com

Archive of previous messages:
http://lists.topica.com/lists/RE-wrenches/read

List rules & etiquette: www.mrsharkey.com/wrenches/etiquette.php

Check out participant bios: www.mrsharkey.com/wrenches/

Hosted by Home Power magazine

Moderator: michael.welch at homepower.com

Your free subscription is supported by today's sponsor:
-------------------------------------------------------------------
Is your computer freezing up or slowing down?
Repair corrupt files and harmful errors - protect your PC Take a 
2-minute PC health check-up at no charge!
http://click.topica.com/caadaSrbz8Qcsbz9JC9f/PC Powerscan
-------------------------------------------------------------------

- - - -
To send a message: RE-wrenches at topica.com

Archive of previous messages: http://lists.topica.com/lists/RE-wrenches/read

List rules & etiquette: www.mrsharkey.com/wrenches/etiquette.php

Check out participant bios: www.mrsharkey.com/wrenches/

Hosted by Home Power magazine

Moderator: michael.welch at homepower.com
--^----------------------------------------------------------------
This email was sent to: michael.welch at homepower.com

EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9.bWljaGFl
Or send an email to: RE-wrenches-unsubscribe at topica.com

For Topica's complete suite of email marketing solutions visit:
http://www.topica.com/?p=TEXFOOTER
--^----------------------------------------------------------------